Crusher.



T. L. 8: T. J. STURTEVANT.

GBUSHEB.

APPLICATION FILED 001227, 1908.

1,01 3,459. Patented Jan. 2, 1912.

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UNITE STATES PATENT OFFICE.

THOMAS LEGGETT STURTEVANT, OF QUINCY, AND THOMAS JOSEPH STURTEVANT, 0F WELLESLEY, MASSACHUSETTS, ASSIGNORS T0 STURTEVANT MILL COMPANY, A

CORPORATION OF MAINE.

oRUsHER.

Specification of Letters Patent.

Application filed October 27, 1908.

Serial No. 459,691.

To all whom it may concern:

Be it known that we, THOMAS L. STURTE- VANT and THOMAS J. STURTEVANT, citizens of the United States, residing, respectively, at Quincy and Wellesley, in the county of Norfolk and State of Massachusetts, have invented or discovered certain new and useful Improvements in Crushers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to that class of rocking jaw crushers in which the side plates are of steel and are comparatively thin or light, with a view to easy transportation in mountainous countries or over rough roads; and the invention has for its object to provide a crusher of this class which may be constructed at a minimum cost, but whichwill be durable and efiicient in operation. In this class of crushers in which the frames comprise relatively thin plates more or less difficulty has been experienced in providing suitable bearings at the rear portions of the frames for the driving shafts carrying the cams or eccentrics for operating the crushing jaws, as the strains and shocks are so great on these shafts that their bearings, when not sufficiently braced, are likely to be thrown out of alinement, so thatthe machine will soon wear out or be comparatively short-lived for eflicient operation. In our Patent No. 859,348, of July 9, 1907, we show and describe a construction intended to obviate this difliculty, and while the construction of said patent has proved to be efficient it has been found to be expensive to manufacture, and the present invention, which is an improvement on the construction of our said patent, is much cheaper to make than the construction of our said patent, and is equally eflicient in operation.

In the present improved construction we provide at the rear of the crusher a somewhat massive angle cross-beam, and we also provide somewhat heavy bearing-blocks for the driving shaft which are bolted to the said angle cross-beam and to the side plates of the frame. This rigid cross-beam not only stifl'ens the frame of the crusher but also insures great rigidity of the bearingblocks for the driving shaft, so that these bearing-blocks, in cooperation with the heavy angle cross-beam, to which they are rigidly bolted, as also to the side plates of the frame, secures a frame of great rigidity, and at the same time one which is relatively light as compared with the heavy cast metal frames of some rocking jaw crushers of this class.

In the accompanying drawings, Figure 1 is a perspective view of our improved crusher, with one of the fly wheels removed. Fig. 2 is a side view of the same with one of the side plates removed, and one of the fly wheels omitted, and Fig. 3 is a cross section on line 33, Fig. 2.

Referring to the drawings, 12 denotes the side plates of the crusher frame and which, for lightness and strength, are preferably of steel, said frame also comprising a head block 13 at the front end of the frame, and an angle crossbeam 14 at the rear end of said frame, said part-s being secured together, by a considerable number of throughbolts. Rigidly bolted to the angle crossbeam and to the side plates are bearingblocks 15 having flanged portions registering with said angle cross beam, and in which bearing blocks is mounted the driving shaft 16 provided, in the present instance, with a double cam 17. Running in contact with the said cam is a roller 18 carried by a swinging lever 19 which operates the rocking jaw 20 through the medium of the interposed toggleplate 21. Said rocking jaw 20 carries the moving crushing plate 22 cooperating with the stationary crushing plate 23 fixed to the head block 13. The roller 18 is held in contact with the cam 17 by means of a pull-back spring 24 encircling a rod 25 connected with the lower or free end of the rocking jaw 20 and engaging an abutment projection 26 formed integral with the angle cross-beam 14; the stress of said spring being properly regulated by means of a nut 27 on said rod 25. The bearing blocks 15 are provided with cap plates or portions 28 suitably bolted to said blocks. I

With a crusher constructed as above described, with the bearing blocks for the driving shaft rigidly secured to the somewhat massive angle cross-beam 14 by an approximately vertical and horizontal series of through-bolts 29, which pass through the flanged portions of said bearing blocks and also through the side plates 12 and the angle cross beam 14, the rear portion of theframe is so stiffened and the bearing blocks so Patented Jan. 2, 1912.

rigidly attached to the frame that the driving shaft will be able to sustain the great stress and shocks to which it is at times exposed, without any possibility of loosening its bearings; while at the same time the crusher may be constructed at less expense than the crusher of our said Patent No. 859,348, in which the bearings for the driving shaft were,formed integral with the rear cross-beam. By forming the abutment proj ection 26 integral with the angle cross-beam 14 the rigidity of the lower arm of said cross-beam is augmented, as will be understood.

The bearingrblocks 15 have projections or sleeve-like portions 30 projecting inward through openings in the side plates 12, said projections shouldering against said sideplates at the walls of said openings, and affording somewhat extended bearings. Owing to the fact that the said bearing blocks are thus shouldered against the said side plate, which are interposed between said blocks and the angle cross-beam 14, they serve, to a certain extent, to relieve the bolts 29 of 'a part of the crushing strains, so that this construction assists in preventing any changes of alinement of the shaft bearings.

Having thus described our invention we claim and desire to secure by Letters Patent:

1. A crusher comprising in its frame construction side plates, a rear, angle cross-beam having vertical and horizontal arms or flanges extending upwardly and inwardly, respectively, from the rear lower corner of the frame, and bearing-blocks having flanged portions registering with said angle crossbeam, the said bearing blocks being secured to said side plates and angle beam by a series of bolts passing through the said flanged portions of said blocks and also through said side plates and the vertical and horizontal arms or flanges of said angle cross-beam.

2. A crusher comprising in its frame con struction side plates having openings, a rear, angle cross-beam having vertical and horizontal arms or flanges extending upwardly and inwardly, respectively, from the rear lower corner of the frame, and bearingblocks having flanged portions registering 'with said angle cross-beam, the said bearing blocks being secured to said side plates and angle cross-beam by a series of bolts passing I through the flanged portions of said bearing blocks and also through said side plates and the vertical and horizontal arms or flanges of said angle cross-beam, said bearing-blocks having projections extending inward through said openings in saidside-plates and shouldering against the walls of said openings.

3. In a crusher, the combination with side plates, ahead block, and a rear, angle crossbeam comprising vertical and. horizontal arms or flanges, and provided with an abutment projection, of bearing blocks having flanged portions registering with said angle cross-beam, bolts passing through the said flanged portions of said bearing blocksand also through the said side plates and rear angle cross-beam, and serving to secure these parts rigidly together, a driving shaft j ournaled in said bearing blocks and provided with a cam or eccentric, a rocking jaw operated from said cam or eccentric, a pull-back spring engaging said abutment projection, and a pull-back rod connected with said rocking jaw and. which is encircled by said spring.

4. In a crusher, the combination with side 30 plates, a head block, and a rear, angle crossbeam comprising vertical and horizontal arms or flanges and provided with an abutment projection, of bearing blocks having flanged portions registering with said angle 5 cross-beam, bolts passing through the said flanged portions of said bearing blocks and also through the said side plates andsaid angle cross-beam so as to secure said parts rigidly together, a driving shaft journaled in said bearing blocks and provided with a cam or eccentric, a rocking jaw operated from said cam or eccentric, a pullback spring engaging said abutment projection, and a pull-back rod connected with said rocking jaw and which is encircled by said spring, said bearing-blocks having projections extending inward through openings in said side-plates and shouldering against'the walls of said openings.

In testimony whereof we aflix our signatures, in presence of two'witnesses.

THOMAS LEGGETT STURTEVANT. THOMAS JOSEPH STURTEVANI.

Witnesses:

C. M. SWEENEY, J. D. KLINGE.

Copies of this patent maybe obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

